Effect of times in heat straightening on stress corrosion cracking of 7N01 aluminum alloy

被引：0

作者：

Li S. ^{[1
]}

Dong H.-G. ^{[2
]}

Wang X.-X. ^{[1
]}

Liu Z.-Y. ^{[1
]}

Zhao J.-J. ^{[1
]}

机构：

[1] School of Mechanical Engineering, North China University of Water Resources and Electric Power, Zhengzhou

[2] School of Materials Science and Engineering, Dalian University of Technology, Dalian

来源：

Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2020年 / 30卷 / 05期

基金：

中国国家自然科学基金;

关键词：

Aluminum alloy; Heat straightening; Non-equilibrium segregation; Slow strain rate test; Stress corrosion cracking;

D O I：

10.11817/j.ysxb.1004.0609.2020-35761

中图分类号：

学科分类号：

摘要：

Stress corrosion cracking behavior of 7N01-T5 aluminum alloy was investigated using slow strain rate test (SSRT) and transmission electron microscope (TEM). The results show that the stress corrosion cracking susceptibility increases with increasing the times in heat straightening. The main reason lies in the transformation of intergranular precipitation and the diffusion of solute elements Zn and Mg from matrix to grain boundary. The effective time of non-equilibrium segregation of solute elements Zn and Mg during three times of heat straightening is less than the critical time, tc, according to the theory of non-equilibrium segregation. Consequently, the contents of solute elements Zn and Mg at grain boundaries gradually increase with increasing the times in heat straightening, which leads to an increase in corrosion potential difference between the grain boundary and its surrounding substrate, thus results in the increase of stress corrosion cracking susceptibility of 7N01-T5 aluminum alloy. © 2020, Science Press. All right reserved.

引用

页码：1010 / 1018

页数：8

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